21420241100 has 18 divisors (see below), whose sum is σ = 46481923404. Its totient is φ = 8568096400.

The previous prime is 21420241093. The next prime is 21420241103. The reversal of 21420241100 is 114202412.

It is not an unprimeable number, because it can be changed into a prime (21420241103) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 107101106 + ... + 107101305.

It is an arithmetic number, because the mean of its divisors is an integer number (2582329078).

Almost surely, 2^21420241100 is an apocalyptic number.

21420241100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21420241100 is an abundant number, since it is smaller than the sum of its proper divisors (25061682304).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21420241100 is a wasteful number, since it uses less digits than its factorization.

21420241100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214202425 (or 214202418 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21420241100 its reverse (114202412), we get a palindrome (21534443512).

The spelling of 21420241100 in words is "twenty-one billion, four hundred twenty million, two hundred forty-one thousand, one hundred".